Investigating flow instabilities caused by entrapped air: Infiltration-outflow experiment monitored by neutron tomography

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21110%2F12%3A00201386" target="_blank" >RIV/68407700:21110/12:00201386 - isvavai.cz</a>

Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Investigating flow instabilities caused by entrapped air: Infiltration-outflow experiment monitored by neutron tomography

Popis výsledku v původním jazyce

Temporal variation of quasi saturated hydraulic conductivity of soil is often ascribed to changing fraction of the entrapped air and it is not considered in standard theory of water flow in porous media. Variation of quasi steady state flow was observedduring ponded infiltration experiments on three small undisturbed samples of coarse sandy loam. Two main flow irregularities typical for soil under study were detected for two soil samples during recurrent ponding experiment: (1) Gradual decrease of thequasi-saturated hydraulic conductivity (Kqs) soon after outflow appeared and (2) lower Kqs during the second infiltration run. The third sample didn't produce similar variability. Series of neutron tomography images of the sample taken during quasi-steady state stage of the first infiltration run showed air trapping in many of large pores and cavities. Furthermore, many of entrapped air bubbles increased in volume during the course of the first infiltration run. Further entrapped air red

Název v anglickém jazyce

Investigating flow instabilities caused by entrapped air: Infiltration-outflow experiment monitored by neutron tomography

Popis výsledku anglicky

Temporal variation of quasi saturated hydraulic conductivity of soil is often ascribed to changing fraction of the entrapped air and it is not considered in standard theory of water flow in porous media. Variation of quasi steady state flow was observedduring ponded infiltration experiments on three small undisturbed samples of coarse sandy loam. Two main flow irregularities typical for soil under study were detected for two soil samples during recurrent ponding experiment: (1) Gradual decrease of thequasi-saturated hydraulic conductivity (Kqs) soon after outflow appeared and (2) lower Kqs during the second infiltration run. The third sample didn't produce similar variability. Series of neutron tomography images of the sample taken during quasi-steady state stage of the first infiltration run showed air trapping in many of large pores and cavities. Furthermore, many of entrapped air bubbles increased in volume during the course of the first infiltration run. Further entrapped air red

Druh

O - Ostatní výsledky

CEP obor

DF - Pedologie

OECD FORD obor

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Projekt

<a href="/cs/project/GA103%2F08%2F1552" target="_blank" >GA103/08/1552: Proudění vody a transport rozpuštěných látek v pórovitém prostředí za přítomnosti nespojité plynné fáze</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2012

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů